输电塔结构的两层面承载力分析设计与优化
发布时间：2018-07-21 17:56
【摘要】：输电塔是电网的重要结构,其承载安全性及经济性与电力运营安全及其社会影响密切相关。因而,开展输电塔承载力设计与优化研究,具有重要的社会意义及经济价值。本文在结构承载力分析的弹性模量缩减法(Elastic Modulus Reduction Method,简记为EMRM)基础上,围绕输电塔结构的两层面承载力分析设计与优化,开展了以下研究工作：(1)研究建立了输电塔结构常用薄壁构件的齐次化广义屈服函数。针对输电塔结构常用的圆管和角钢构件,通过回归分析和最小二乘法建立了薄壁构件截面的齐次广义屈服函数,通过误差分析确定了其最高阶次,为广义屈服函数引入极限分析的弹性模量调整法奠定了理论基础。(2)研究建立了输电塔结构极限承载力分析的弹性模量缩减法(EMRM)。引入圆管和角钢构件的齐次化广义屈服函数,定义了构件的单元承载比,依据承载比均匀度建立了弹性模量调整的动态阈值,并根据变形能守恒原则建立了弹性模量调整策略,提出了输电塔结构极限承载力分析的EMRM,克服了传统弹性模量调整法因不满足比例条件所导致的计算精度和稳定性不良问题。(3)研究提出了输电塔结构的两层面承载力分析与设计方法。引入输电塔结构极限承载力分析的EMRM,采用单元承载比定义了构件承载比,根据构件承载比迭代过程确定了高、低承载构件的判别准则,并利用首步和末步迭代分析结果求解构件安全系数和结构整体安全系数,根据截面强度和安全系数之间的正比例关系,按照预定的结构整体安全系数确定高承载构件的截面强度,使输电塔结构同时在构件和整体两个层面上满足承载安全要求,从而为定量设计输电塔结构整体承载力提供了良好的方法。(4)研究提出了输电塔结构的两层面承载力优化方法。以输电塔结构两层面承载力安全要求为主要约束条件,以均匀承载,即最大化结构承载比均匀度为优化目标,根据构件截面强度与构件承载比的反比例关系,建立了低承载构件截面强度的优化调整策略,提出了输电塔结构两层面优化设计方法,能提供承载安全性能和经济性能均优的结构设计方案。该优化方法不仅解决了结构整体承载力优化设计的难题,而且能够与传统的结构设计方法相融合。
[Abstract]:Transmission tower is an important structure of power grid. Its bearing safety and economy are closely related to power operation safety and its social impact. Therefore, carrying capacity design and optimization research of transmission tower has important social significance and economic value. On the basis of Elastic Modulus reduction method (EMRM), this paper analyzes and optimizes the two-layer bearing capacity of transmission tower structure. The following research works are carried out: (1) the homogeneous generalized yield function of thin-walled members of transmission tower structures is established. The homogeneous generalized yield function of thin-walled members is established by regression analysis and least square method, and the highest order is determined by error analysis. It lays a theoretical foundation for introducing the elastic modulus adjustment method into the limit analysis of the generalized yield function. (2) the elastic modulus reduction method (EMRM) for the analysis of the ultimate bearing capacity of transmission tower structures is established. In this paper, the homogeneous generalized yield function of circular tube and angle steel member is introduced, and the unit bearing ratio is defined, the dynamic threshold of elastic modulus adjustment is established according to the uniformity of bearing ratio, and the adjustment strategy of elastic modulus is established according to the principle of conservation of deformation energy. In this paper, EMRM for the ultimate bearing capacity analysis of transmission tower structure is proposed, which overcomes the problem of poor calculation accuracy and stability caused by the traditional elastic modulus adjustment method which does not meet the proportional condition. (3) the two-layer bearing capacity of the transmission tower structure is studied. Force analysis and design method. In this paper, EMRM is introduced to analyze the ultimate bearing capacity of transmission tower structure, and the element bearing ratio is used to define the component bearing ratio. According to the iterative process of the component bearing ratio, the criterion of high and low bearing member is determined. The first and last step iterative analysis results are used to solve the safety factor of the component and the overall safety factor of the structure, according to the positive ratio between the section strength and the safety factor, According to the predetermined overall safety factor of the structure, the section strength of the high bearing member is determined, so that the transmission tower structure can meet the bearing safety requirements both on the member level and on the whole level. It provides a good method for quantitative design of the overall bearing capacity of transmission tower structure. (4) the optimization method of two-layer bearing capacity of transmission tower structure is proposed. Taking the safety requirement of the two-layer bearing capacity of transmission tower structure as the main constraint condition, and taking the uniform bearing capacity, that is, maximizing the uniformity of the bearing ratio of the structure as the optimization objective, according to the inverse proportion relationship between the section strength of the member and the bearing ratio of the member. The optimal adjustment strategy of the cross-section strength of the low bearing member is established, and the two-layer optimization design method of the transmission tower structure is proposed, which can provide the structural design scheme with both the safety and economic performance of the transmission tower. This optimization method not only solves the problem of structural overall bearing capacity optimization design, but also can be integrated with the traditional structural design method.
【学位授予单位】：广西大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU347;TU312.1
本文编号：2136323
[Abstract]:Transmission tower is an important structure of power grid. Its bearing safety and economy are closely related to power operation safety and its social impact. Therefore, carrying capacity design and optimization research of transmission tower has important social significance and economic value. On the basis of Elastic Modulus reduction method (EMRM), this paper analyzes and optimizes the two-layer bearing capacity of transmission tower structure. The following research works are carried out: (1) the homogeneous generalized yield function of thin-walled members of transmission tower structures is established. The homogeneous generalized yield function of thin-walled members is established by regression analysis and least square method, and the highest order is determined by error analysis. It lays a theoretical foundation for introducing the elastic modulus adjustment method into the limit analysis of the generalized yield function. (2) the elastic modulus reduction method (EMRM) for the analysis of the ultimate bearing capacity of transmission tower structures is established. In this paper, the homogeneous generalized yield function of circular tube and angle steel member is introduced, and the unit bearing ratio is defined, the dynamic threshold of elastic modulus adjustment is established according to the uniformity of bearing ratio, and the adjustment strategy of elastic modulus is established according to the principle of conservation of deformation energy. In this paper, EMRM for the ultimate bearing capacity analysis of transmission tower structure is proposed, which overcomes the problem of poor calculation accuracy and stability caused by the traditional elastic modulus adjustment method which does not meet the proportional condition. (3) the two-layer bearing capacity of the transmission tower structure is studied. Force analysis and design method. In this paper, EMRM is introduced to analyze the ultimate bearing capacity of transmission tower structure, and the element bearing ratio is used to define the component bearing ratio. According to the iterative process of the component bearing ratio, the criterion of high and low bearing member is determined. The first and last step iterative analysis results are used to solve the safety factor of the component and the overall safety factor of the structure, according to the positive ratio between the section strength and the safety factor, According to the predetermined overall safety factor of the structure, the section strength of the high bearing member is determined, so that the transmission tower structure can meet the bearing safety requirements both on the member level and on the whole level. It provides a good method for quantitative design of the overall bearing capacity of transmission tower structure. (4) the optimization method of two-layer bearing capacity of transmission tower structure is proposed. Taking the safety requirement of the two-layer bearing capacity of transmission tower structure as the main constraint condition, and taking the uniform bearing capacity, that is, maximizing the uniformity of the bearing ratio of the structure as the optimization objective, according to the inverse proportion relationship between the section strength of the member and the bearing ratio of the member. The optimal adjustment strategy of the cross-section strength of the low bearing member is established, and the two-layer optimization design method of the transmission tower structure is proposed, which can provide the structural design scheme with both the safety and economic performance of the transmission tower. This optimization method not only solves the problem of structural overall bearing capacity optimization design, but also can be integrated with the traditional structural design method.
【学位授予单位】：广西大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU347;TU312.1
【引证文献】
相关会议论文 前3条
1 王坤;梁波;;基于遗传算法的输电铁塔结构优化[A];第十一届全国结构工程学术会议论文集第Ⅱ卷[C];2002年
2 刘彦君;严慧;;单角钢截面的极限屈服面及其应用[A];第四届全国结构工程学术会议论文集（上）[C];1995年
3 刘应华;岑章志;徐秉业;;三维结构极限分析的数值方法[A];第三届全国结构工程学术会议论文集（上）[C];1994年
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